I think that playing game is sometimes it's good. But sometimes it is not good.
If people play game to get rid of stress, that is a good thing.
But if people play game and get addicted to it, that is not a good thing.

Explanation: It is used to mean the thing, situation, or idea that has already been talked about. To be poisoned cannot be used in the sentence because it is not appropriate. Probably, you are referring to the instances when people can't stop playing games. The word for it is addicted.

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